Abbott, 26, a personal trainer and “fitness model”, revealed that Loch proposed in her kitchen, holding a bottle of champagne while she was putting peas in the freezer.

“He said, ‘Why aren’t you asking me why I’m holding champagne?’ So I said, ‘OK ... why are you holding champagne?’ He said, ‘Well, I thought we could drink it after I asked you to marry me,’” Abbott told Stellar magazine.

Loch, 34, is a former professional rower who has competed in both the 2008 and 2012 Olympics.

He’s now a weightlifter, clocking around 120kg on the scales.

The daughter of former PM, Tony Abbott, Frances Abbott and fiance, Sam Loch spend their days working out, walking and running long distances up and down hills around Palm Beach. Picture: Matrix Media Group.Source:Matrix Media Group

The couple have since moved in together and plan to get married this year.

The announcement stunned Abbott’s followers — more than 10,000 people follow her Instagram account Not Another Fitness Blogger — after she described herself as “so single” in an interview in Harper’s Bazaar Australia.

“I always describe myself as ‘so single’, because that’s how single I am. Like, very, very single. But I also think it’s probably the best time to compete, because I don’t have a guy saying, ‘Let’s go get some dinner!’” she told the magazine, explaining her ultra-healthy lifestyle.

Abbott and Loch met through a mutual friend who thought the pair would get along. Abbott made the first move and sent him a message. Their first date, in mid-October, was over a coffee.

“Everyone’s like, ‘Wow, this is really fast,’” Abbott said.

“But it feels so natural to me. His energy, it’s so grounding. When I am around him, I am like, ‘This is what it’s meant to be like.’ Life is short, and love is special, and sometimes you just need to follow your instincts.”